I've been sent this image, and while it looks like a PNC-50S, I've never seen one that shows a canopy in any of the images I've seen of the SST or the Sandpiper. Does anyone recognize it?
The excessive flashing and closed loop seems to indicate that his is not an original blow molded part.
More likely a cast reproduction. Moldin' Oldies does not have this in their current line-up, but perhaps they did at one time?